package com.qianyan.utils;

import java.security.MessageDigest;

public class MD5 {
	
	private final static String[] hexDigits = {"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};
	
	private static String byteArrayToHexString(byte[] b){
		StringBuffer resultSb = new StringBuffer();
		for(int i=0;i<b.length;i++){
			resultSb.append(byteToHexString(b[i]));
		}
		return resultSb.toString();
	}
	
	private static String byteToHexString(byte b){
		int n = b;
		if(n<0) n=256+n;
		int d1 = n/16;
		int d2 = n%16;
		return hexDigits[d1]+hexDigits[d2];
	}
	
	public static String MD5Encode(String origin){
		String resultString = null;
		try{
			resultString = new String(origin);
			MessageDigest md = MessageDigest.getInstance("MD5");
			resultString = byteArrayToHexString(md.digest(resultString.getBytes()));	
		}catch(Exception ex){
			ex.printStackTrace();
		}
		return resultString;
	}
}
